Air filter



A. JORDAHL June 3-, 1930.

AIR FILTER Filed May 20, 1924 FIGZ.

- Patented June 3, 1930 PATENT oFFrcE ANDERS Jon'mmnor NEW'YOBK', N. Y.

AIR FILTER Application filed May 2o,

. This invention relates to an air or gas filter of the type in which a plurality of individual and interchangeable filter units are assembled into a structure of varying sizes and 5 capacities.. 'Such filters consist ofv a stationaryframe'into which removable filter units are adapted to be inserted. Heretofore the stationary framework consisted of individual frames made of metal bars of angle or '10 channel cross-section, the several frames being assembled together by means of a plural ity of bolts passing through the walls of adjoining frames. The filter units are made of sheet metal of angle or Z-shape in cross-section and are inserted into the stationary prov denovel securing means for the filter.

frames in such a manner that the flanges of the filter units fit against the front flanges -of the stationary frames, being thus re movably secured thereto, The body of the filter units will therefore extend .intothe stationary frame, thus clearin the heads of the bolts connecting the a joiningframes' A number of disadvantages have. been found in this arrangement, somei of which are the following: The joints between adjoining stationary frames are a source of considerable air leakage. The efi'ective area of the filter units and consequently of the filter medium must be considerably.

units to the frames is very diificult and relquires very exact and expensive workmansh1p. These are all serious disadvantages lters must be much smaller the stationary framework. Y

In the present invention an of'the foregoing difliculties have been overcome by'efiEident and simple means and it is an object of i lthis invention that the stationary framework forms pigeon holes into which the filter units 0 are removably inserted without having to resmaller than the total area of the stationary by a flanged metal plate member 3 compristending to decrease the usefulness and efli-I' ciericy of .the filters andit isparticularly agreat drawback that the effective area of the than the area of 1924. Serial No. 714,676.

holes of thin flanged sheet 'metal wherebythe flanges are produced ,on-the-rear or inside of the framework to thus act as stops to which the filter units can be pressed so that a substantially airtight joint is produced. It is a further object of this invention to. provide frame structures which can be built u or increased to accommodate as many glter units as desired. A still further object s to unit in the framework and such means comprises a plate adapted to be inserted into the framework and'by means of a wedge or a pinscrew it can force the filter unit against the framework. r

Other objects will-be apparent from the following specification taken'in connection with the accompanying drawing in which the same reference characters indicate corresponding parts throughout, andin which:

Fig. 1 '1s asectional'view of several sec- .tions of the framework,

'Fig. 2 is a plan view of Fig. 1, and

Fig. 3 is a sebtional view showing details of the frame.-

'The stationary framework can either be built up of cast, rolled, drawn or bent shapes,

or it can consist of individual frames-of sheet metal, each forming a pigeon hole to receive 85 a filter unit. As shown on the drawing, the

frame comprises as many sections OLfPlgBOll holes 2 as desired'and these holes are ormed high and'narrow as for instance a widthof' two pigeon liolesand a height'of six holes, it is preferable to provide bracing means and such means may oomprise'diagonal braces 7 which may be welded or riveted on the rear of the flanges 4. If desired two dlagonal braces may be secured to each pigeon hole or only one, or any combination may be used, de ending upon the size and circumstances.

The unit filter can be built in any desired form'but it is here shown as comprising a channel frame member 9 having the flanges turned towards the filter medium,

flanged metal late member 3 having a thin plate 4 from w ich the flanges 8 are pressed therein. The plate 4 has a bent portion 13 adapted to gri section, thus at the end opposite the flange 8 forming an interlocking portion by means of which it is the plate of the adjoining orming interlocking joints.

, Each section is provided with two straight outside edges and two bent edges whereby any number of sections can be securely joined together to form one unitary structure. In

order to insure a more secure connection, these sections may beseoured together at the inner end by means of bolts 14 which however do not interfere with the filter unit. The special plate or clip 22 may be provided in opposite corners and this' plate comprises projections'23 adapted to fit inslots in the so that the plate cannot be lostpurpose of applying a wedging action to thus thin plate 4 but these slots are'made so that the projections shall have ample clearance so that they can b removed for the purpose of removing the fiiter. A chain 24 may be secured to the plate and tothe fra ewoi'lk or t e orce the filter unit against the flange a wedge may" be "driven between the filter and this gate 22 but preferably a pins'crew 25 may used, which abuts against and forces the filter against the flange. Fig. 3 shows a section of the securing means in place, but it must be remembered that the filter unit has clearance between it and the frame so that it caneasily be removed.

Fig. '3 is similar to the construction shown in Figs. 1 and 2 except that the-flange 20 made in a single .integral' piece instead ofbeing'a double piece, and shows the holding means for the filter unit 5. a

It is of course understood that these frames can be built in any desired shape and 'size and for the purpose of makin a square framework, angle bars 21 can be bolted.

used to which theside of the frames or. sections can mg portlon on the edges of said members,

By means of the fianges 8 the filter units can be forced against these flanges to thus form an air-tight joint and from the draw ing it will be seen that the frame member 9 will abut against this flange. If desired the filter unit can be constructed so that a clearance will be maintained between it and the frame.

I claim as my invention:

1. vAn air and gas filter comprising a stationary framework of individual interlocked frames,each frame composed of members forming'the sides of a receptacle, each receptacle being open at both ends for the as sage of air; flanges on said sides; and a fi lter unitadaptedto be inserted into and-fit conformably in a receptacle and against said flanges, thefwidth and height of the filter unit being respectively equal, except for a slight clearance, to the width and height of the receptacle, and the unit being adapted to be forced against said flanges in order to provide substantially air-tight joints.

2. An air and as filter comprising a sta-.

tionary framewor of individual interlocked frames, the frames composed of members forming the sides of a plurality of receptacles, each receptacle being open at both ends for the passage of. air; flanges on said sides adjacentone end of its respective receptacle; and a filter unit adapted to be removably inserted into and fit conformably in each receptacle and against said flanges, the width and height of the filter unit being respectively equal, except for a slight clearance, to the width and height of the receptacle and the unit'being adapted to be forced against said flanges in order to provide substantially air-tight joints.

3. An air and gas filter comprising a stationary framework composed of members forming the sides of receptacles, each receptacle being open at both ends for the passage of air; flanges on said sides; a bent portion forming an interlocking portion on the edges of said. member said bent portions being adapted to interlock with the edges of adjoining members in order to secure the framework together and a filter unit adapted to be inserted into and fit conformably in a receptacle and against said flan es, the width and height of the filter unit being respectively eq ual, except fora slight clearance, to the wldth and height of the receptacle and the unitbeing adapted to be forced against said flanges in order to provide substantially -air-' tight joints. I e

4. An air and gas filter comprising a stationary framework composed of members which form the sides ofa plurality of receptacles, each receptacle bemg open atboth ends for the passage of air; flanges .onsaid sides adjacent one end of its respective rece tacle; a bent portion forming 'aifinterloc said bent portions being adapted tointerlock with the edges of adjoining members in order to secure the framework together;

and a filter unit removably inserted into each receptacle and a ainst said flan es, the width and height of t e filter unit eing respectively equal, except for a slight clearance, to the width and height of the receptacle.

5. An air and gas filter comprising a stationary framework composed of members forming the sides of receptacles, each receptacle having four sides and,being open at both ends for the passage-0f air; flanges on said sides; a bent portion forming an interlocking portion on the edges of two sides'of' the frame, said bent portions being ada ted to interlock with the other two edges 0 adjoining members in order to secure the framework together; and a filter unit adapted to be inserted into a receptacle and a ainst said flanges, the. width and height 0 the filter unit being respectivelyequal, except for a slight clearance, to the width and height of the receptacle and the unit being adapted to be forced against saidfianges in order to provide substantially air-tight joints.

6. An air and gas filter comprising a stationary framework composed of members forming the sides of receptacles, each receptacle being open at both ends for the passage of air; flanges on said sides; a bent portion forming an interlocking portion on certain edgesof said members, said bent portions being adapted to interlock with the edges of ad oining members in order to secure the framework together; a filter unit adapted to be inserted into a receptacle and against said flanges, the width and height ofthe filter unlt" being equal, except for a slight clearance, to the width and height-of the receptacle and the unit being adapted to be forced, against said flanges in order to provide substantially air-tight joints; and a plurality ofbqlts to,

'form additional securing means for said framework. a air and gas filter comprising a stationary framework composed of members formin' the sides of receptacles, each receptacle having four sides and bein open at both ends for the passage of air; anges on said sides; a bent portion forming an interlocking portion on theedges of two sides of the frame, said bent portions being adapted to interlock with the other two edges of adjoining members in order to secure the framework together; afilter'unit adapted to be inserted into a receptacle and against-said flanges, the width and height of the filter unit being equal, except for a, slight clearance, to the width and height of the receptacle and the unit being adapted to be'forcedagainst-said flanges in order to provide substantially airti ht joints; and a plurality of bolts to'form a ditional. securing means for said framework.

8. A sectional frame for unit air filters comprising four members secured together to form a receptacle for the filter unit; a flange in said members which is adapted to form an abutment for the unit; and interlocking means on the edges of two members which are adapted to grip the other two members of adjoining receptacles, in order to rigidly secure the receptacles together.

9. Asectional frame for unit air filters comprising four members secured together to form a receptacle for the filter unit; a flange I in said members which is adapted to form an abutment for the unit; interlocking means on the edges of two members which are adapted to grip the other two members of adjoining receptacles in order to rigidly secure the receptacles together; and additional securing means for said members. 10. An air and gas filter comprising a stationary frame work composed of members forming the sides of receptacles, each'receptacle being open at both ends for the passage of air; flanges on said sides a bent portion form- 1 ing an interlocking portion on the edges of certain members, said bent portions being adapted to interlock with the edges of adjoining. members 1n order to secure the framework together; a filter unit adapted to be cle being open at both ends for the passage of air; flanges on said sides a bent portion formv ing an interlocking portion on the ed es of certain members, said bent portions eing adapted to interlock with the edges of adj oining members in order to secure the framework together; a filter unit adapted to be inserted into a receptacle and against. said flanges, the width and height of'the filter unit being equal, except for a slight clearance, to the each receptacle adapted to t in slots in the members; and a pin screw threaded in each clip, for forcing said pnit against said flanges width and height of the rece tacle; a clip for in order to provide substantially air-tight joints.

12. An air and gas filter comprising a stationary frame-work composed of members forming the sides'of receptacles, each receptacle having four sides and bein open at both ends forthepassage of air; anges on said sides; abent portion forming an interlocking portion on the edges of two sides of the frame, said bent portions being adapted to inter-' loclrwith the. other two of adjoining 7 adapted to be forced a ainst said flanges in 1,7eo,eee

members in order to secure the framework to- Y gether a filter unit adapted to be inserted into a I a receptacle and a must said flan'gw, the width and height of t e filterunit being equal, exce t for a slight clearance, to the width and heig t of the receptacle and the unit being order to provide su stantially air-tight joints; and clips and pin screws for fore-' in said unit against said flanges. i1 testimony whereof I afiix m 'signature.

' ANDERS JO DAHL. 

